George L. Mosse, born Gerhard Lachmann Mosse into the prominent Jewish-owned Mosse publishing family in Berlin, was a German-born historian who fled Nazi Germany following the 1933 seizure of power. His family first escaped to France and then England, where he attended a Quaker boarding school after studying at the elite boarding school Schloss Salem on Lake Constance. Mosse emigrated to the United States, earning a PhD in history from Harvard University in 1946. He began his academic career specializing in English constitutional history of the 16th and 17th centuries and Protestant theology, holding professorships at the University of Iowa, the University of Wisconsin-Madison, and the Hebrew University of Jerusalem. In 1966, he co-founded and co-edited The Journal of Contemporary History with Walter Laqueur. His prolific output exceeded 25 books, profoundly shaping modern studies on fascism, National Socialism, racism, masculinity, and sexuality through emphasis on their cultural and ideological roots. Later in his career, Mosse openly explored his Jewish identity and homosexuality, challenging historical stereotypes of outsiders and influencing fields like German studies and modern European intellectual history. His provocative scholarship, marked by personal insight, earned enduring recognition, including the George L. Mosse Program in History at the University of Wisconsin-Madison.